1    /STACK_PCS

    Specifies that stack PC values are collected for I/O services
    data. This is the default upon entry into the Collector.

2    /NOSTACK_PCS

    Specifies that no stack PC values are collected for I/O services
    data.

3    /USER_ROUTINE

       /USER_ROUTINE=(image-name,entry-routine,exit-routine)
       /USER_ROUTINE=(image-name,entry-routine,)
       /USER_ROUTINE=(image-name,,exit-routine)

    Specifies that the specifed user routines shall be called at the
    start and end of each system service call.

    Qualifier Parameter         Description

    image-name                  The shareable image containing the
                                entry-routine or/and exit-routine.
    entry-routine               The routine to call before calling
                                the system service. The null string
                                (i.e. "") indicates no routine is to
                                be called.
    exit-routine                The routine to call after calling the
                                system service. The null string (i.e.
                                "") indicates no routine is to be
                                called.

    The following rule applies regarding the /USER_ROUTINE qualifier:

    1. Only one of the entry and exit routines may be null;

    For more information on user routines in PCA, see the HELP entry
    for User_Routines.

4    /NOUSER_ROUTINE

       /NOUSER_ROUTINE

    Specifies that no user routines shall be called at the start and
    end of each system service call. This is the default upon entry
    into the PCA Collector.